Question

A boy claps his hand when he is 420m from the bottom of the cliff. he heard the eco after 2.4 second. what is the speed of sound

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Answer 1

350 m/s

Step-by-step explanation:

Answer 2

350 m/s

Step-by-step explanation:

In order for Boy to hear the sound, the sound has to travel from his hands to the cliff, and then BACK to him from the cliff to his ears.

So the sound has to travel (2 x 420m) = 840 m.

Speed = (distance) / (time)

Speed = (840 m) / (2.4 sec)

Speed = 350 m/s